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Old 02-16-2008   #1 (permalink)
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900 idle problems?

hi all. sorry to dive in with a problem but!

i have a problem with tickover. otherwise it runs ok!

i can get the idle set (approx 1200 revs?) , ride up the road, roll off, and it races at 4-5k revs. reset, ride again and it cuts out?

just cant get tickover to hold!

any ideas please?


tried new plugs and carbs are ballanced
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Old 02-17-2008   #2 (permalink)
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It could be a clogged jet or maybe a split boot between a carb and the head. The racing makes me think a lean condition.
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Old 02-17-2008   #3 (permalink)
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I was having exactly the same problem until my starter motor died !
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Old 02-17-2008   #4 (permalink)
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Quote:
Originally Posted by Mr Multiplicity View Post
I was having exactly the same problem until my starter motor died !

did the new s/motor cure it?
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Old 02-17-2008   #5 (permalink)
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It happened on Friday and haven't had time to sort it yet !
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Old 02-18-2008   #6 (permalink)
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Binding throttle cable?
Mark
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Old 02-19-2008   #7 (permalink)
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all the obvious seem to be ok! ie: cables seem free, no obvious leeks in the pipes, mixture seems ok looking at the plugs we tookout and the carbs have been cleaned (as much as a layman knows how to!) but the problems are different when engine is warm as to when its cold?

the choke does nothing much on cold startup, but lifts the revs when hot!

sailfish sems close (im guessing air leak) but we cant see anything!

does that help anyone?

Last edited by harry99 : 02-19-2008 at 08:10 PM.
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Old 02-19-2008   #8 (permalink)
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Try spraying WD40 (or something similar) around the carb boots and vaccum lines while the engine is running, the engine should either pickup rpms or stumble, also did you check the float levels and try setting the idle mixture screws (pilot screws / about 2.5 turns out from lightly seated). Keep us posted.

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Old 02-20-2008   #9 (permalink)
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Harry,
Do as lanesplitter says to check for vac leeks. Also, check the choke slide linkage on the carbs. It's thin and can bend easy if not carefull when working on carbs and can hold one or more carb chokes slightly open. Also, when starting the engine cold and using the choke, you'll notice engine will run at idle or slightly above when you first start the engine. If you blip the throttle after a few seconds with the choke on, engine should run up to appx 2000rpm's or more. Closing the choke brings the rpm's back down. Set the idle to appx 1000 to 1200 rpm's with the engine HOT. Blip the throttle a few times when turning the adjustment to ensure it's settled(adjustment cable has a slight kink because of the bend, so be mindfull of that, it takes a little fiddling). When that's done, engine should idle appx 700 to 900 rpm when COLD with NO choke. Either throttle up slightly by hand, or use a little choke till warm enough to idle without stalling or using choke. Once engine is up to operating temps, should idle at 1000 to 1200 rpm's again. Sounds goofy, I know, but this is the way mine has been since new('02 1200) and my 96 T'bird also(sold). Once you get it set and used to it, it shouldn't be any probs. JUST MAKE SURE YOU BLIP THE THROTTLE WHEN ADJUSTING THE IDLE OR IT WILL BIND AND NOT SET RIGHT!!!!
Oh, before I forget, check your throttle cable end play. Make sure rpm's don't rise or fall when turning the handle bars from lock to lock.

Hope this helps.
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Old 02-20-2008   #10 (permalink)
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I'm thinking something with the choke - linkage or cable sticking.
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